The present invention relates to a method for separating an ATM cell and an MPLS cell. In particular, the matching board defines an extra bit in addition to the ATM cell format to indicate whether an ATM cell is present, and determines the corresponding bit in a forwarding engine (F / E) board. The present invention relates to an ATM cell and an MPLS cell separation method for separating an ATM cell and an MPLS cell.;In the MPLS system based on the conventional ATM switch, a cell delay occurs while several steps are unnecessary until a pure ATM cell is transmitted to the F / E, and the CPU controlling the SAR transmitter / receiver in the F / E I did unnecessary processing.;According to the present invention, in a MPLS system based on an ATM exchanger, the LIC or LIC MUX stores a range that a VPI / VCI value of a pure ATM cell can have, and tags each input cell as a pure ATM cell or an MPLS cell. By examining the corresponding tag bits at the input ICB interface of the F / E, it is possible to minimize delays and improve the quality of pure ATM service when a pure ATM cell passes through an MPLS node or network.;In addition, by reducing the load on the SAR chips and CPU in the F / E, it is possible to increase the service performance associated with MPLS.
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